DUAL NONELECTRIC FIRING SYSTEM

TM 9-1300-277

Figure 5-20. Electrical tape splicing.

5-19. DUAL ELECTRIC FIRING SYSTEM

5-18. DUAL NONELECTRIC FIRING SYSTEM

This consists of two independent nonelectric

This consists of two independent electric

systems for firing a single charge or set of charges.

circuits, each with an electric blasting cap in each

Figure 5-22 shows the layout for nonelectric dual firing

charge, so that the firing of either circuit will detonate all

system for a single charge. If two or more charges are

to be fired simultaneously, two detonating cord ring

mains (fig. 5-23) are laid out, and a branch line from

5-20. COMBINATION DUAL FIRING SYSTEM

each charge is tied into each ring main. Additional

reliability can be obtained from dualdetonating cord-

The combination dual firing system uses an

primed firing systems by extending the cap ends of the

electric and nonelectric firing system (fig. 5-25). Each

lead-in detonating cords, as shown in figure 5-23, and

charge is primed electrically and nonelectrically. Both

tying them together in a square knot (girth hitch with one

the electric and nonelectric systems must be entirely

extra turn), or by connecting the cord with detonating

independent of each other. The nonelectric system

cord clips.

must be fired first.

Change 1

5-17